[PATCH v10 1/3] /proc/pid/status: Add support for architecture specific output

Aubrey Li
2019-02-12T12:09:11Z

The architecture specific information of the running processes could
be useful to the userland. Add support to examine process architecture
specific information externally.

Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
---
fs/proc/array.c | 5 +++++
include/linux/proc_fs.h | 2 ++
2 files changed, 7 insertions(+)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 9d428d5a0ac8..ea7a981f289c 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -401,6 +401,10 @@ static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
}

+void __weak arch_proc_pid_status(struct seq_file *m, struct task_struct *task)
+{
+}
+
int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
@@ -424,6 +428,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
task_cpus_allowed(m, task);
cpuset_task_status_allowed(m, task);
task_context_switch_counts(m, task);
+ arch_proc_pid_status(m, task);
return 0;
}

diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index d0e1f1522a78..1de9ba1b064f 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -73,6 +73,8 @@ struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mo
int (*show)(struct seq_file *, void *),
proc_write_t write,
void *data);
+/* Add support for architecture specific output in /proc/pid/status */
+extern void arch_proc_pid_status(struct seq_file *m, struct task_struct *task);

#else /* CONFIG_PROC_FS */

--
2.17.1